Ezyoutdoor 3 in 1 Emergency Gear Outdoor Camping Survival SOS Whistle Compass Thermometer with Lanyard for Picnic Hiking Camping Hunting Survival Multi-functional design provides whistle compass thermometer functions, good outdoor tool;Nylon neck rope design convenient for you to take with Notice: Compass and thermometer function can not compared with professional tool, not quite accurate Plastic whistle with nylon neck lanyard Has a small liquid filled compass on one side and a thermometer on the other Temperature range: -20 C to 50 C ;Neck lanyard length: 45cm( approx) ;Dimension:5cm(L)*2.5cm(W)*2.3cm(H)( approx);Perfect for Boating, Camping, Hiking, or Hunting etc Package included:2PCS x 3 - in - 1 Survival Whistle with Compass and Thermometer;Lifetime Warranty;7-15 days shipping date with tracking number